Pretty sure he's not coming with the Spazer. If we're lucky it might be a separate accessory pack or heaven forbid, a webshop limited. Magazine scans did show him with a Space Thunder effect part though.

I've been hoping to own an SOC Grendizer since I started collecting. Though it doesn't have a Spazer, this SRC version gives me the chance to make it happen. I do hope they make Daimos, Voltes, and Mekanda down the line...

I'm betting on the articulation on the neck (it really can bend back further then most robots, and there's even a indentation on the back of his helmet to really look up).
That there will be a Spazer. It's the only reason they would give so much articulation there. I don't have those Mazinger's but I doubt they could look up like Grendizer can.

The hole more or less confirms the Double Spazer. I'm still skeptical about getting the big saucer Spazer. The question now becomes whether the accessory pack will be sold normally or be web exclusive, and whether we'll get the Marine and Drill Spazers. The Double Spazer isn't substantial enough to be sold on it's own. Some kind of special stand maybe? They'll probably toss in the TFO to pad the accessory pack out.